Toilers are people who work long and hard. Any employer would be grateful to have toilers as employees.
If you know that to toil is to work hard, then the meaning of toiler won't be a surprise. A toiler works strenuously; you won't see a toiler hanging out by the water cooler. People with physical jobs such as construction workers and miners are often referred to as toilers. However, if you work long hours at anything — such as being a writer or a lawyer — you're a toiler.